GM GM 93 5.7L VIN 7 TBI Trouble Code Info

GM

93 5.7L VIN 7 TBI
Trouble code Fault location Probable cause
00 *(see below for                 additional                      information) No fault found
11 Malfunction indicator lamp (MIL) – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, MIL bulb, supply wire, ECM
12 Start of diagnosis No RPM signal received
13 Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds. Wiring open circuit, O2S, ECM
14 Coolant temperature sensor signal indicates a temperature of over 275° F for 2 seconds. Wiring short circuit to ground, ECT sensor, ECM
15 Coolant temperature sensor signal indicates a temperature colder than -27° F for 30 seconds after the engine has been running for at least 30 seconds. Wiring open circuit, ECT sensor, ECM
16 Ignition system – low resolution pulse Wiring open circuit/short circuit to ground/short circuit to positive, distributor, ECM
18 Injector(s) – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, supply wire, injectors, ECM
21 TPS sensor voltage was above 2.5 volts for 8 seconds when the MAP sensor signal showed manifold vacuum to be 15 pounds or more. Wiring open circuit/short circuit to positive, TP sensor, TP sensor interface module, ECM
22 TPS voltage was under 0.2 volts when the engine was running. Wiring open circuit/short circuit to ground, TP sensor, TP sensor interface module, ECM
23 Inlet air temperature sensor signal showed an air temperature below -22° F after the engine has been running for 5 minutes. On Fleetwood the inlet air temperature signal shows a temperature below -20° F for 5 seconds at a speed less than 44 MPH. Wiring open circuit, IAT sensor, ECM
24 When engine speed was between 1200 and 4400 RPM and throttle position angle was less than 3%, the MAP signal showed low voltage (high manifold vacuum) for at least 5 seconds. Wiring open circuit/short circuit to ground, VSS, VSS buffer module, park neutral position circuit, ECM
25 Inlet air temperature sensor signal showed an air temperature over 302° F after the engine has been running for 5 minutes. On Fleetwood the inlet air temperature signal shows a temperature above 297° F for 5 seconds at a speed less than 44 MPH. Wiring short circuit to ground, IAT sensor, ECM
26 Quad-Driver sense voltage shows a low voltage for 5 seconds where battery voltage should be present, or the sense voltage shows battery voltage for 25 seconds when a low voltage should be present. (Fleetwood only) Wiring open circuit/short circuit to ground/short circuit to positive, ECM controlled components, ECM **(see below for additional information)
27 Exhaust gas recirculation (EGR) vacuum control – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, EGR valve, ECM
28 Transmission range (TR) pressure switch Wiring open circuit/short circuit to ground, ECM
29 Secondary air injection (AIR) system Wiring open circuit/short circuit to ground/short circuit to positive, AIR valve relay, ECM
32 EGR open command did not change MAP sensor signal. Normal EGR flow should cause slight decrease in manifold vacuum which would change MAP sensor signal. Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM, hoses blocked/leaking, exhaust system blocked
33 MAP sensor signal voltage was too high (low vacuum) for 5 seconds when throttle opening was under 4%. Wiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34 MAP sensor signal voltage was too low (high vacuum) when engine speed was over 1200 RPM. On Fleetwood the engine speed was over 1000 RPM with a throttle position angle above 21%. Wiring open circuit/short circuit to ground, MAP sensor, ECM
36 Ignition system high resolution or extra low resolution pulse – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, distributor, ECM
37 Brake switch stuck ON Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM
38 Brake switch stuck OFF Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM
41 The EST signal was present when the circuit should have been grounded by the ignition module when it received bypass voltage under 1 volt. (Fleetwood only) Wiring open circuit, DI control module, ECM
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module. Wiring open circuit/short circuit to ground/short circuit to positive, brake switch, ECM
43 The ECM did not detect a knock signal during near wide open throttle operation with coolant temperature above 194° F or the knock signal was present for 4 seconds or more during normal engine operation. Wiring open circuit/short circuit to ground/short circuit to positive, KS, insecure PROM, ECM
44 Oxygen sensor voltage was under 0.25 volts for 50 seconds of closed loop operation. On Fleetwood the engine speed was over 1000 RPM with a throttle position angle above 21%. Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, MAP sensor, O2S, ECM
45 Oxygen sensor voltage was over 0.75 volts for 30 seconds with a throttle angle greater than 20%. On Fleetwood the oxygen sensor voltage was 0.75 volts for 30 seconds in a closed loop with a throttle angle either greater than 20% or less than 2%. Wiring open circuit, fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, MAP sensor, ECM
46 Anti-Theft Pass Key signal was wrong when ignition was turned to start position. Incorrect ignition key, wiring open circuit/short circuit to ground/ short circuit to positive, immobilizer control module, ECM
47 Knock sensor (KS) – circuit malfunction Insecure PROM, ECM
48 Mass air flow (MAF) sensor – circuit malfunction Wiring open circuit/short circuit to ground/ short circuit to positive, MAF sensor, ECM
50 System voltage low Wiring open circuit/short circuit to ground, alternator, ECM
51 PROM error. Insecure PROM, incorrect PROM, ECM
53 System voltage high Alternator, ECM
54 Fuel pump voltage was not present at fuel pump sense line for 2 seconds after the ECM has sent the fuel pump on command. Wiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp switch, fuel pump, ECM
55 Engine control module (ECM), fuel lean monitor Fuel filter/lines blocked, fuel pump
58 Transmission fluid temperature (TFT) sensor – high temperature indicated Wiring short circuit to ground
59 Transmission fluid temperature (TFT) sensor – low temperature indicated Wiring open circuit, TFT sensor, ECM/td>
63 Heated oxygen sensor (H2OS) bank 2 – open circuit Wiring short circuit to ground/short circuit to ground/short circuit to positive, HO2S, ECM
64 Heated oxygen sensor (HO2S) bank 2 – mixture lean Wiring short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, secondary air system, ECM
65 Heated oxygen sensor (HO2S) bank 2 – mixture rich Fuel pressure high, injector(s) leaking, EVAP canister purge valve, TP sensor, EGR system, HO2S contamination, MAF sensor, ECM
66 A/C refrigerant pressure sensor circuit – open or short circuit Wiring open circuit/short circuit to ground/short circuit positive, A/C refrigerant pressure sensor, ECM
67 A/C refrigerant pressure sensor circuit – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor
68 A/C compressor clutch relay – circuit malfunction Wiring short circuit to ground/short circuit to positive, A/C compressor clutch relay
69 A/C compressor clutch – circuit malfunction Wiring open circuit, A/C compressor clutch relay, ECM
70 A/C compressor clutch relay – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, A/C compressor clutch relay, ECM
72 Vehicle speed sensor (VSS) – circuit malfunction Wiring open circuit, VSS, ECM
73 Pressure control solenoid – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, ECM
74 Traction control system (TCS), circuit malfunction Wiring short circuit to ground, ABS control module trouble code(s) stored, ECM
75 Transmission system – voltage low Supply wire, alternator, ECM
77 Engine coolant blower motor relay 1 – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower motor relay, ECM
78 Engine coolant blower motor relay 2 – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower relay, ECM
79 Transmission fluid – overtemp Wiring open circuit/short circuit to ground, TFT sensor, ECM
81 Transmission shift solenoid (SS), 2nd-3rd – circuit malfunction Wiring open circuit/short circuit to ground, SS, ECM
82 Transmission shift solenoid (SS), 1st-2nd – circuit malfunction Wiring open circuit/short circuit to ground, SS, ECM
83 Torque converter clutch (TCC) solenoid, pulse width modulated – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, TCC solenoid, ECM
84 Transmission shift solenoid (SS), 3rd-2nd – circuit malfunction Wiring open circuit/short circuit to ground, SS, ECM
85 Torque converter clutch (TCC) – stuck ON Wiring open circuit/short circuit to ground, transmission mechanical fault, TCC solenoid
90 Transmission TCC solenoid – circuit malfunction Wiring open circuit/short circuit to ground, TCC solenoid, ECM
95 Change oil lamp – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil life lamp bulb, ECM
96 Engine oil level warning lamp – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensro, ECM
97 Vehicle speed sensor (VSS) – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, VSS, ECM
* Code 00 is displayed when accessing trouble codes with the A/C control panel.   -Transmission shift solenoids (SS)
**Depending on model, year and equipment level, the following components may be connected to this circuit.  Use of the vehicle wiring diagram is recommended to confirm which components are fitted.
-A/C compressor clutch
-A/C condenser blower motor relay
-Air bypass valve-Engine coolant blower motor relay
-Engine coolant ‘hot’ warning lamp
-Evaporative emission (EVAP) canister purge valve
-Exhaust gas recirculation (EGR) solenoid
-Malfunction indicator lamp (MIL)
-Secondary air pump relay
-Transmission shift warning light (MT)
-Torque converter clutch (TCC) solenoid